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Reporting Segments (Tables)
 6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Reporting segment operations data is presented in the following table for the indicated periods:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Revenue:
 
 
 
 
 
 
 
GETS
$
84,437

 
$
84,288

 
$
166,958

 
$
166,542

PSS
149,392

 
184,730

 
310,818

 
364,869

MRI
12,992

 
15,264

 
26,503

 
29,143

Total revenue
$
246,821

 
$
284,282

 
$
504,279

 
$
560,554

 
 
 
 
 
 
 
 
Gross profit:
 
 
 
 
 
 
 
GETS
$
21,849

 
$
22,805

 
$
42,791

 
$
45,205

PSS
18,326

 
22,809

 
37,585

 
44,755

MRI
6,472

 
7,183

 
13,041

 
13,600

Total gross profit
$
46,647

 
$
52,797

 
$
93,417

 
$
103,560

 
 
 
 
 
 
 
 
Operating profit:
 
 
 
 
 
 
 
GETS (1), (2)
$
1,487

 
$
2,215

 
$
1,835

 
$
3,771

PSS (1)
2,957

 
6,867

 
7,113

 
13,012

MRI
1,574

 
1,752

 
3,030

 
3,012

Corporate (3)
(4,815
)
 
(3,846
)
 
(9,635
)
 
(8,122
)
Total operating profit
1,203

 
6,988

 
2,343

 
11,673

Other income (expense), net
(97
)
 
8

 
(84
)
 
(74
)
Income before income taxes
$
1,106

 
$
6,996

 
$
2,259

 
$
11,599